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2a. EDTA titration of Ca²+ + Mg2+ ions at pH 10 using calmagite indicator Data Trial Trial 2 Volume of tap water sample (accurate to ±0.1 mL) 2.84 mL 2.84 mL mL Volume of 0.01 M EDTA titrant Initial buret reading 0.13 1.05 1.96 mL mL mL Final buret reading 1.05 mL 1.96 mL 2.88 ml Net volume of 0.01 M EDTA titrant 0.92 mL 0.91 mL 0.92 mL Volume of bottled water sample (accurate to ±0.1 mL) 5.57 mL mL mL Volume of 0.01 M EDTA titrant Initial buret reading 3.50 4.12 mL mL mL Final buret reading mL 4.12 4.74 mL Net volume of 0.01 M EDTA titrant 0.62 mL 0.62 mL 0.62 mL Calculate the concentration of Ca²+ + Mg2+ in the tap water and bottled water samples in mmol/L. Show a sam- ple calculation in the space below: C₂· V₂ = 4₁.V₁ Trial 1 C₁.VI 0.01 x 1.05 2.84 = 0.00369 mol → 3.69 mmol/L Calculations Trial Trial 3 Concentration of Ca²+ + Mg2+ in tap water samples mmol/L 10.1 mmol/L Concentration of Ca²+ + Mg²+ in bottled water samples 7.39 8.51 mmol/L mmol/L Tap water average for Ca2+ + Mg2+: mmol/L 7.39 Bottled water average for Ca²+ + Mg²+: mmol/L Using the average value of the Ca²+ + Mg2+ concentrations in millimoles per liter, calculate using Equation (7) the water hardness of the tap water and bottled water in units of mg/L of CaCO3. Show a sample calculation in the space below: mmol My cacos = (Ca²+ + Mg²+) X Imol Cados (mol Ca²+ + My²t) x 100g CaCO3 Mul CaCO3 369 Tap water hardness: ром mg/L CaCO3 (ppm) Bottled water hardness: mg/L CaCO3 (ppm) Tap water- 3.69 mmol/L 3.68 mmol x 369 ppm 0.00369 +0.00690+ 0.0101/3 29-14 1001 5.57 2.88 3.50 3.69 6.28 mol mmol/L mmol/L 6.89 = 5.57 Trial 2 6.90 Trial 3 2.84

2a. EDTA titration of Ca²+ + Mg2+ ions at pH 10 using calmagite indicator Data Trial Trial 2 Volume of tap water sample (accurate to ±0.1 mL) 2.84 mL 2.84 mL mL Volume of 0.01 M EDTA titrant Initial buret reading 0.13 1.05 1.96 mL mL mL Final buret reading 1.05 mL 1.96 mL 2.88 ml Net volume of 0.01 M EDTA titrant 0.92 mL 0.91 mL 0.92 mL Volume of bottled water sample (accurate to ±0.1 mL) 5.57 mL mL mL Volume of 0.01 M EDTA titrant Initial buret reading 3.50 4.12 mL mL mL Final buret reading mL 4.12 4.74 mL Net volume of 0.01 M EDTA titrant 0.62 mL 0.62 mL 0.62 mL Calculate the concentration of Ca²+ + Mg2+ in the tap water and bottled water samples in mmol/L. Show a sam- ple calculation in the space below: C₂· V₂ = 4₁.V₁ Trial 1 C₁.VI 0.01 x 1.05 2.84 = 0.00369 mol → 3.69 mmol/L Calculations Trial Trial 3 Concentration of Ca²+ + Mg2+ in tap water samples mmol/L 10.1 mmol/L Concentration of Ca²+ + Mg²+ in bottled water samples 7.39 8.51 mmol/L mmol/L Tap water average for Ca2+ + Mg2+: mmol/L 7.39 Bottled water average for Ca²+ + Mg²+: mmol/L Using the average value of the Ca²+ + Mg2+ concentrations in millimoles per liter, calculate using Equation (7) the water hardness of the tap water and bottled water in units of mg/L of CaCO3. Show a sample calculation in the space below: mmol My cacos = (Ca²+ + Mg²+) X Imol Cados (mol Ca²+ + My²t) x 100g CaCO3 Mul CaCO3 369 Tap water hardness: ром mg/L CaCO3 (ppm) Bottled water hardness: mg/L CaCO3 (ppm) Tap water- 3.69 mmol/L 3.68 mmol x 369 ppm 0.00369 +0.00690+ 0.0101/3 29-14 1001 5.57 2.88 3.50 3.69 6.28 mol mmol/L mmol/L 6.89 = 5.57 Trial 2 6.90 Trial 3 2.84

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 15.BCP
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2a. EDTA titration of Ca²+ + Mg²+ ions at pH 10 using calmagite indicator Data Trial Trial 2 Volume of tap water sample (accurate to ±0.1 mL) 2.84 mL 2.84 mL mL Volume of 0.01 M EDTA titrant Initial buret reading 0.13 1.05 1.96 mL mL mL Final buret reading 1.05 mL 1.96 mL 2.88 ml Net volume of 0.01 M EDTA titrant 0.92 mL 0.91 mL 0.92 mL Volume of bottled water sample (accurate to ±0.1 mL) 5.57 mL mL mL Volume of 0.01 M EDTA titrant Initial buret reading 3.50 4.12 mL mL mL Final buret reading 3.50 mL 4.12 4.74 mL Net volume of 0.01 M EDTA titrant 0.62 mL 0.62 mL 0.62 mL Calculate the concentration of Ca²+ + Mg2+ in the tap water and bottled water samples in mmol/L. Show a sam- ple calculation in the space below: C₂·V₂ = 4₁.V₁ Trial 1 C₁.VI 0.01 x 1.05 2.84 = 0.00369 mol 3.69 mmol/L Calculations Trial Trial 3 Concentration of Ca²+ + Mg2+ in tap water samples mmol/L 10-1 mmol/L Concentration of Ca²+ + Mg²+ in bottled water samples 7.39 8.51 mmol/L mmol/L Tap water average for Ca2+ + Mg²+: mmol/L 7.39 Bottled water average for Ca²+ + Mg²+: mmol/L Using the average value of the Ca²+ + Mg2+ concentrations in millimoles per liter, calculate using Equation (7) the water hardness of the tap water and bottled water in units of mg/L of CaCO3. Show a sample calculation in the space below: mmol my cnco₂ = (Ca²+ + Mg²+) X Imol Cadog (mol Cart + My²t) x 100g CaCO3 Mul CaCO3 Tap water hardness: ром mg/L CaCO3 (ppm) Bottled water hardness: mg/L CaCO3 (ppm) Tap water- 369 ppm 0.00369 +0.00690+ 0.0101/3 29-14 369 3.69 mmol/L 3.68 mmol x 3.69 1001 5.57 2.88 6.28 mol mmol/L mmol/L 6.89 = 5.57 Trial 2 6.90 Trial 3 2.84
Transcribed Image Text:2a. EDTA titration of Ca²+ + Mg²+ ions at pH 10 using calmagite indicator Data Trial Trial 2 Volume of tap water sample (accurate to ±0.1 mL) 2.84 mL 2.84 mL mL Volume of 0.01 M EDTA titrant Initial buret reading 0.13 1.05 1.96 mL mL mL Final buret reading 1.05 mL 1.96 mL 2.88 ml Net volume of 0.01 M EDTA titrant 0.92 mL 0.91 mL 0.92 mL Volume of bottled water sample (accurate to ±0.1 mL) 5.57 mL mL mL Volume of 0.01 M EDTA titrant Initial buret reading 3.50 4.12 mL mL mL Final buret reading 3.50 mL 4.12 4.74 mL Net volume of 0.01 M EDTA titrant 0.62 mL 0.62 mL 0.62 mL Calculate the concentration of Ca²+ + Mg2+ in the tap water and bottled water samples in mmol/L. Show a sam- ple calculation in the space below: C₂·V₂ = 4₁.V₁ Trial 1 C₁.VI 0.01 x 1.05 2.84 = 0.00369 mol 3.69 mmol/L Calculations Trial Trial 3 Concentration of Ca²+ + Mg2+ in tap water samples mmol/L 10-1 mmol/L Concentration of Ca²+ + Mg²+ in bottled water samples 7.39 8.51 mmol/L mmol/L Tap water average for Ca2+ + Mg²+: mmol/L 7.39 Bottled water average for Ca²+ + Mg²+: mmol/L Using the average value of the Ca²+ + Mg2+ concentrations in millimoles per liter, calculate using Equation (7) the water hardness of the tap water and bottled water in units of mg/L of CaCO3. Show a sample calculation in the space below: mmol my cnco₂ = (Ca²+ + Mg²+) X Imol Cadog (mol Cart + My²t) x 100g CaCO3 Mul CaCO3 Tap water hardness: ром mg/L CaCO3 (ppm) Bottled water hardness: mg/L CaCO3 (ppm) Tap water- 369 ppm 0.00369 +0.00690+ 0.0101/3 29-14 369 3.69 mmol/L 3.68 mmol x 3.69 1001 5.57 2.88 6.28 mol mmol/L mmol/L 6.89 = 5.57 Trial 2 6.90 Trial 3 2.84
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